You should start with installing Racket on your computer.
For example, on Debian you should issue this command as root:

aptitude install racket

This command will install Racket environment on your computer.

Next you should install bystroTeX using this command as normal user
(i.e. not root):

racket -e '(require (planet "amkhlv/bystroTeX/slides_setup.rkt"))'

This command will talk back to you, asking some questions and giving further instructions.
In particular, it will ask you to choose a folder where a sample slide presentation is stored.
After the installation, go to that sample folder.